A benign tumor composed of mature nerve tissue and ganglion cells, usually growing slowly and rarely becoming dangerous.
From ganglion + neuroma (Greek 'neur-' meaning nerve + '-oma' meaning tumor). This compound describes a tumor containing both ganglion structures and nerve tissue.
Ganglioneuromas are like forests of nerve tissue gone slightly wild—they grow slowly and mostly peacefully, which is why doctors often just watch them rather than immediately surgically remove them! They're most common in children and teenagers.
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